linux-kernel - [PATCH] dib7000m: Remove unnecessary null test

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Message-ID: <20140715213117.GA28037@himangi-Dell>
Date:	Wed, 16 Jul 2014 03:01:17 +0530
From:	Himangi Saraogi <himangi774@...il.com>
To:	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] dib7000m: Remove unnecessary null test

This patch removes the null test on ch. ch is initialized at the
beginning of the function to &demod->dtv_property_cache. Since demod
is dereferenced prior to the null test, demod must be a valid pointer,
and &demod->dtv_property_cache cannot be null.

The following Coccinelle script is used for detecting the change:

@r@
expression e,f;
identifier g,y;
statement S1,S2;
@@

*e = &f->g
<+...
 f->y
 ...+>
*if (e != NULL || ...)
 S1 else S2

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/media/dvb-frontends/dib7000m.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/media/dvb-frontends/dib7000m.c b/drivers/media/dvb-frontends/dib7000m.c
index 148bf79..dcb9a15 100644
--- a/drivers/media/dvb-frontends/dib7000m.c
+++ b/drivers/media/dvb-frontends/dib7000m.c
@@ -1041,10 +1041,7 @@ static int dib7000m_tune(struct dvb_frontend *demod)
 	u16 value;
 
 	// we are already tuned - just resuming from suspend
-	if (ch != NULL)
-		dib7000m_set_channel(state, ch, 0);
-	else
-		return -EINVAL;
+	dib7000m_set_channel(state, ch, 0);
 
 	// restart demod
 	ret |= dib7000m_write_word(state, 898, 0x4000);
-- 
1.9.1

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